| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_SH_FUTEX_CAS_H |
| #define __ASM_SH_FUTEX_CAS_H |
| |
| static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval, |
| u32 __user *uaddr, |
| u32 oldval, u32 newval) |
| { |
| int err = 0; |
| __asm__ __volatile__( |
| "1:\n\t" |
| "cas.l %2, %1, @r0\n" |
| "2:\n\t" |
| #ifdef CONFIG_MMU |
| ".section .fixup,\"ax\"\n" |
| "3:\n\t" |
| "mov.l 4f, %0\n\t" |
| "jmp @%0\n\t" |
| " mov %3, %0\n\t" |
| ".balign 4\n" |
| "4: .long 2b\n\t" |
| ".previous\n" |
| ".section __ex_table,\"a\"\n\t" |
| ".long 1b, 3b\n\t" |
| ".previous" |
| #endif |
| :"+r" (err), "+r" (newval) |
| :"r" (oldval), "i" (-EFAULT), "z" (uaddr) |
| :"t", "memory"); |
| if (err) return err; |
| *uval = newval; |
| return 0; |
| } |
| |
| #endif /* __ASM_SH_FUTEX_CAS_H */ |
